Medical Research Council [MR/M007367/1] Funding Source: Medline; Wellcome Trust [203077, 092654] Funding Source: Medline; World Health Organization [001] Funding Source: Medline; NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [P30AI027757] Funding Source: NIH RePORTER; MRC [MR/M007367/1] Funding Source: UKRI